andrews MAXXflo EVO Series Installation And Maintenance Manual page 54

6.1.1.6 INSPECT AND FLUSH DHW STORAGE TANK
The storage tank should be inspected annually and cleaned if required. To gain access for inspection please carry
out the following procedure:
• Turn off the electrical supply to the heater
• Shut of the cold water supply to the tank
• Open a hot water outlet until water fl ow stops
• Shut off hot water outlet and return feed to the tank.
• Drain off approximately 5 - 10 litres of water from the tank drain point (see illustration below).
Tank drain valve
• Remove the insulation material on the top of the tank to reveal the tanks connections.
• If necessary, disconnect any pipework connections to allow removal of the Tank Inspection Hatch.
Clamp nut
• Loosen nut on Tank Inspection Hatch and unscrew bolt to the end of the thread, but do not remove.
• Wrap a length of wire around the threaded shaft underneath the clamp and hold the wire to prevent the hatch
falling into the tank, when the bolt is removed
• Tap the hatch, so that the hatch drops downwards and is held in place by the nut.
• Remove the bolt and clamp and while holding the threaded shaft allow the hatch to drop down and then angle
the hatch and remove it through the opening.
With the use of a torch it should be possible to see to the very bottom of the inside of the tank. If the tank is clear of
deposits then no further action is necessary and the hatch can be replaced as a reverse of the above procedure.
Take care not to drop the hatch into the tank when replacing it.
If the tank requires fl ushing, allow all the water to fl ow from the tank by opening the drainage tap fully . A hose pipe
connected to the cold water supply, can be inserted into the hatch opening to wash away any remaining deposits
out of the drainage tap. In areas with hard water, it maybe necessary to fl ush out the water heater more frequently.
To refi ll the tank after inspection or fl ushing, perform the following procedure:
• Close the drainage tap
• Secure the inspection hatch
• Turn on the cold water supply to the tank and open the hot water return pipework
• Open hot water outlets in turn until all air is expelled
• Turn on the power to the heater and activate a hot water demand.
Maintenance 54
Inspection hatch
Clamp
MAXXfl o EVO